C# - Delegate Threading Overhead In Wepage Lookup?
Dec 1, 2010
I have a web app where a user will visit a page with a QueryString parameter passing the ID of the object I should retrieve.
What I then need to do is run a number of checks to ensure the user can access that data, and also find out if another user has a lock (recorded in the DB) on that object.
Currently these searches are all performed sequentially, however I'm thinking the best option might be to use delegates to be able to fire off the three or four searches required at once then use the results as they are returned.
My implementation for this would be using a delegate(s) and calling BeginInvoke, however I'm worried the overhead of threading this may lead to no speed increases.
My research has indicated it will use the ThreadPool, so there shouldn't be too much overhead, but I'd like to know if anyone has implemented this kind of solution to a similar scenario on a high traffic site and seen good resutls from it?
The reason I'm looking to do this is we are reengineering our application from the ground up, and need to make sure we are building something that will scale considerably.
MSDN says that MemoryCache's instance members are not thread safe. (http://msdn.microsoft.com/en-us/library/system.runtime.caching.memorycache(VS.100).aspx)
Does that mean every time I call Get() or Add() in a action method I have to wrap it with a lock?
I want to use my functions in DAL asynchronously by executing them in a separate thread. The issue in all this is suppose I have a function DAL.GetProducts() which returns a DataTable. If I execute this function in a separate thread, when it is completed how do I get the returned DataTable from this thread and bind it to my UI?
I'm trying to do some multi-threading in my asp.net web site. But I'm having trouble getting my child thread to interact with my main thread. In the following very simple example I would expect that, 3 seconds after clicking the button, the "Hello World" text would be displayed on my page and on my label. Instead, after a few seconds, I get the following error in a pop-up box "WebDev.WebServer20.exe has stopped working - Windows is checking for a solution to the problem.". I am running Visual Web Developer 2010 Express. If you know why I'm getting this error and if you know how to fix the problem respond.
I'm trying to get threading to work in ASP.NET but for some reason it keeps crashing my local server, and simply does not work at all when uploaded online. Here's the code:
protected void testThread() { for (int i = 0; i < 10; i++)
This may seem like a really simple question, but can I use the System.Threading namespace in ASP.NET web forms? I have a web page which uses HTTP GET/POST to gather page customisations (title, subtitle, etc.) from the user and numerical input which is passed to a ASMX web service. Currently they work sequentially, the customisation first followed by numerical processing. So can I use threading to do this?
In my ASP.NET website, I am having a function which has to be automatically performed once every 2-3 mins on its own, i.e. without user intervention. This function contains database access.
Can I use threading to perform this process in background?
If Yes, How can I use that?
Edit
Also I am not looking for a solution which includes windows service because I am using shared hosting. So I dont have all the rights to access the host computer.
I'm a completly noob in Multi-Threading c# web pages... and i'm taking the first steps... I have one web page that create one new thread for each image to load. Each thread only read the external image and save it to local server. I have for example pages that have 25 images... that page loads but it launchs 25 thread (1 for each image).
The code:
[Code]....
I assumed that when a thread finish it's job it will automaticaly be killed, is it that way ?? I'm asking because, when i try this code on the server, after some navegation and multiple images loaded the IIS goes down and the page return "Service Unavailable" error :( To solved it i need to restart the IIS Application Pool... For those that have experience in multi-threading web pages how can i kill this threads ? Aren't they suposed to be killed when their job is finish ? ? Do you know a good tutorial or article for begginers ???
I have a Main page containing links to five other pages. each page has a button which does some job using Thread. Problem is when i open a window from main page and click the button, The Process starts but if now i want to open another page from main window it doesn't load untill that previous page loads fully(when thread ends). I am not using any session variable on my page.
I m getting the error System.Threading.ThreadAbortException while exporting datatable to CSV. But export to CSV is completed sucessfully.Here is my Code:
I've got an asp.net application, it's running on DotNetNuke, under load we get the occasional out of memory exception. I've got a dump loaded it into windbg. the end of !dumpheap -stat is
I can't find much information on the System.Threading.ReaderWriterCount, as it seems to be the problem. What is the likely cause? Or failing that what's the best next step to work that out? Based on the pointer from the given answer I had a look at ReaderWriterLockSlim. I wasn't using it directly, but I saw that it had 88684 instances, digging deeper I saw quite a few classes with that number of instances, pointing to AutoMapper.MappingEngine. This should be a singleton, so I've had a look at where it's being created. I suspect that it's the DI container and have made some changes around that to see if it helps
I have a .NET 4.0 console application that does a lot of reads from SQL Server 2008 using the OleDbDataAdapter object.I tried to improve performance by spreading the processing logic across four threads using Visual Studio 2010's Task Parallel Library. Sadly the multi-threaded version is three times slower than the original. Using VS2010's performance tools, I found thousands of thread contentions caused by the method OleDbDataAdapter.Fill() which populates a DataSet.This is puzzling as there are no static classes or variables involved that would result in the OleDbDataAdapter being shared by my threads. Also, four simultaneous connections just can't cause a hold up at the database level, right? The default connection pool size should be much larger than this.
I have one button on my page. On click of this I need to run four methods parallely in four saperate thead and need to show the progress bar for each method. Also need to update the label controls form those threaded methods.
Also I need to user Update panel of AJAX control tool kit to avoid post back to user.
I have used the read pool for that. When I remove the update panel the code works fine and update four labels but when I put the update panel it is not updating the labels.
I am trying to translate or convert C# code that a friend gave me. I have limited C# knowledge but was going along OK until I hit the following code that includes a delegate. I cannot figure out how to get the equivalent functionality in VB.NET. I'm using .NET 2.0 and VS2005.
public bool TryGetRedirectMatch(UrlContext url, out RedirectMatch match) { if (url.Path.StartsWith("/product.aspx", StringComparison.InvariantCultureIgnoreCase))[code]....
I am working with .net 3.5 and making application in asp.net. I show some application which is make in C# in Windows form where i see following code in class level declaration
[Code].... and following code in form load
[Code]....
and following code in some event
[Code]....
Now my problem is I am making application in asp.net code behind VB.net where I cannot how to apply all this in my application. I more confuse with Delegate and BeginInvoke. I read somewhere that to use BeginInvoke in VB you should use Ajax.
I have three textboxes to lookup three different product codes from a product lookup table.
When you enter search criteria in a Textbox it would popup listbox control with Products and
when user selects the product it populates product-id back in to textbox.
I have lookup table and listbox working. However, My problem is I can't figure out how to pupulate TextBox2 if search Criteria was typed into TextBox2and to populate TextBox 3 if the search criteria was typed into textbox 3 etc.
(Not sure if I'm creating this post in the right place. Feel free to move if needed.)
I'm trying to enable full DNS lookup including hostname. Having trouble. I've followed the instructions here
(http://support.microsoft.com/kb/297795) with no luck. Request.ServerVariables("remote_host") still returns only an IP Address.
[Code]....
I've also tried using DNS.GetHostEntry(IPAddress) and the depricated DNS.GetHostByAddress(IPAddress). All I ever get back is the IP Address with no host name.
IIS 6.0, Windows Server 2007 Server Pack 2, .NET 2.0
In my code behind on a button click event I want to set the text of a label to inform the user where in the process we are. How do I create a delegate to allow the label to get updated
I am using ASP .NET and C#, and using the code-behind-pages concept.I am trying to implement a business delegate pattern in ASP .NET to reduce coupling between the presentation and business tiers.I want to have several ASP pages send information (through asp buttons clicks) to a "business delegate" ASP page, which will in turn send the necessary information to a C# method.The problem is that each button_click event in ASP .NET is directly tied to a C# method. I am having trouble understanding how to separate the presentation and business logic because of that.
I am trying to get this to bind to a gridview, without any luck. I would like each asynctask to ultimately return seperate datasets, but for now I can deal with the same one being returned.
